隨著都市快速地發展，都市熱島效應（urban heat island effect, UHI）日益嚴重，其高溫化現象與風環境明顯相關，都市街道通風程度、風道等保持舒適室外風環境的重要因素應受到規劃領域之重視。
室外之通風環境直接影響的是行人對於溫熱環境的感受，對於台灣都市中人行環境中所特有之騎樓，更是保障行人安全行走的絕對空間。但在國內對於室外通風之相關研究則鮮有主題針對騎樓之通風效率，於規劃過程中更缺乏適切的評估方法建立。
本研究利用進行精度驗證後的直接數值模擬（direct numerical simulation, DNS），透過歸納後的台灣都市街谷設計型式，進行各個街谷型態中，人行區域騎樓內高1.5公尺之行人風環境的速度場求解。發現在街谷座向、街谷寬度、街谷高度三個變數中，街谷與騎樓之風環境形塑主要為街谷座向影響相對最大、其次為街谷高度。
研究地區則針對台灣主要都市的台北市、台中市與高雄市，配合三地於2003年至2007年夏季6月至9月之氣象資料，分析該期間中的風向分配，並以最近似原始風向風速資料之韋伯分配（Weibull distribution）疊代出各風向之尺度參數及形狀參數。
而後利用50組不同座向、寬度與高度的街谷中解出的速度場，配合台北、台中、高雄的風向風速韋伯分配參數，以發生機率評估法求算出各街谷騎樓於各地區風速大於每秒1.5公尺的通風程度，發現各地區的韋伯風速分配偏向程度可明顯反映各案例所在之風速機率高低程度，亦即該地區某風向的韋伯分配愈左偏，風速機率愈大。反之該地區某風向的韋伯分配愈右偏，風速機率愈小。
最後透過比較各案例與不同氣候條件所產生之通風程度良窳，提出因地制宜的都市人行空間之風環境規劃參考，希望能提供在都市規劃階段中，可尋的通風策略與規劃方針。

The topic of heat island effect (UHI) is being more and more emphasized in recent years. Since there is a highly correlation between air temperature and outdoor wind environment, urban planners and designers have to consider the wind environment and ventilation path simultaneously when thinking about the future urban development.
In fact, the change of air temperature in urban area has a highly effect on residents’ comfort especially the pedestrians. As the mentioned outdoor wind environment affects the thermal environment of metropolis. However, there is still a long-term ignorance on the discussion of ventilation efficiency in the Taiwanese arcade. It is without mentioning that there should be an imperative assessment in urban planning stage.
After a series of validation, the direct numerical simulation (DNS) was employed accurately in this study to simulate types of urban canyon, the focus area is under the arcade of urban canyons. And further, the observations are all on the height of 1.5 meters above the ground surface. The results showed the orientation of street canyon has a higher effect than the other variables.
The study areas were base on metropolis of Taiwan. There are Taipei City, Taichung City and Kaohsiung City respectively. The meteorological data recorded in summer (June to September) 2003 to 2007 was analyzed to estimate the wind direction and the parameters of Weibull distribution. All of the above parameters were used for exceedance probability assessment.
After the simulation of the 50 urban canyon cases in different orientation, width and height, the wind speed ratios and Weibull parameters were employed in the steps of exceedance probability assessment of the three cities. This study revealed that there is a highly negative correlation between the positively skewed level of Weibull distribution and exceedance probability.
This process not just proves the feasibility of outdoor ventilation assessment in Taiwanese arcade, but the assessment results are capable of giving suggestions for outdoor ventilation strategies in Taiwanese urban planning.

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